"[CCP's Dust 514] is a great example of putting out content that you know is not final," Boyes explained.

"If you want to monetise it, that's fine. I mean, if you want to put out a game that's playable and does pass the checklists and stuff, you can.

"We allow that on all of our platforms, that sort of continually updating and selling. Again, if people buy it and they're passionate about it, and you want to improve it and make it better over time you can."

Dust 514 has been updated over time

Steam introduced a similar scheme earlier this month.

Dubbed Early Access, users can buy games that are still in development, offering feedback to the creative team to improve the experience.

Developers will be able to set their own price for Early Access games, along with the option to increase the price as new features are added or development milestones are reached.

As the development team introduces new features, updates are downloaded automatically.